Juddery and Lumpy on Idle Please Help

[wardygt]

Can anyone help, I have a gt tdi mk5 and the engine runs fine, but on idle the engine is very juddery and lumpy, I was told it was the maf sensor and got that replaced but it has made no difference.
what else could it be?

[wardygt]

also I have disconnected battery for 30mins but didn't make any difference
anyone know what it could be?

[StuF]

Could be the dual mass flywheel?
How many miles has it covered?

[wardygt]

100k

this is exactly what it sounds like just found it on youtube
just had cambelt done and water pumper also

[jaye2992]

When was the egr valve last cleaned?

[Golf_GT_TDI]

fault code scan?

[wardygt]

When was the egr valve last cleaned?

last week I thought that was the problem but hasn't made a difference 

[wardygt]

fault code scan?

maf sensor but that has been changed but made no difference

[jaye2992]

When was the egr valve last cleaned?

last week I thought that was the problem but hasn't made a difference 

Used to have an A3 with the tdi engine in and mine did this badly and even used to stall. Think what i did was use aload of injector cleaner, new fuel filter and egr delete..... after that it was spot on and never did it again.

[wardygt]

[/quote]

Used to have an A3 with the tdi engine in and mine did this badly and even used to stall. Think what i did was use aload of injector cleaner, new fuel filter and egr delete..... after that it was spot on and never did it again.
[/quote]
thank you
I will try that later

[wardygt]

Hi it is in the garage it is NOT
-Injector loom
-Dirty injectors
-Maf senor
-EGR
-ECU issue
-Fuelling issue

It is becoming a mystery and is having all these different tests but still is the issue is not resolved

Does anyone know what else it could be?


 

[john87]

PCV valve possibly need replaced? I'm sure this would cause lumpy/poor idle..

[boustie]

Are there any faults in it ?

[jason_rmh]

PCV valve possibly need replaced? I'm sure this would cause lumpy/poor idle..

TDIs don't have a PCV do they?

My TDI is a bit lumpy. One thing to check is the timing torsion value and injection quantities using vcds.
If injection quantities are out it could pin point the issue to a particular cylinder.
I'm about to start checking this on mine.

Jas

[wardygt]

Are there any faults in it ?

no faults, they are saying

all fine starting from cold until say 2mins (maybe less) of running the lumpiness starts